People have been talking about errors in this thread. I do not think that they are completely worthless. In some cases, I think they show issues to be concerned about. Look at Ryan Zimmerman from last year and his throwing errors. He was throwing the ball away pretty often on routine plays.
Luckily, we have Fangraphs (among other sites, maybe?) which separates the Fielding Errors from the Throwing Errors in its stats.